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Giants on Port chnannel interfaces

mchockalingam
Level 1
Level 1

I have 2 6509 switches connected using Port channel using 6 GigE inetrfaces. 4 out of 6 interfaces show excessive giants.

I checked the speed and duplex settings and I do not see any mismatch. I included the "show int" output for one of the interfaces below.

Any ideas why this is happening?

interface GigabitEthernet1/24

description port channel 1 to switch 2

no ip address

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode desirable

GigabitEthernet1/24 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0011.933b.3ae7 (bia 0011.933b.3ae7)

Description: port channel 1 to switch 2

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, media type is SX

input flow-control is off, output flow-control is desired

Clock mode is auto

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:25, output 00:00:39, output hang never

Last clearing of "show interface" counters 3d00h

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1297000 bits/sec, 282 packets/sec

5 minute output rate 235000 bits/sec, 80 packets/sec

225609840 packets input, 282332161349 bytes, 0 no buffer

Received 538148 broadcasts (502473 multicast)

0 runts, 167204073 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

19302703 packets output, 7387419791 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

3 Replies 3

smif101
Level 4
Level 4

I would ensure that the MTU on both switches is the same throughout. If anything you might need to change it to 1552.

MTU is set to 1500 through out. Should it be 1552?

You can set it that way only on the port channel interfaces and see if that helps.

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